Subject	bog
Predicate	form
Object	on the surface of the tundra in the summer
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.9066
Neighborhood Sigma	0.9336
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source bogs and pools form on the surface of the tundra in the summer 1 Answers.com Questions